| Former (21) |
| Board of Directors | 2017 – 2018 |
| Board of Directors | 2018 – 2019 |
| Board of Directors | 1998 – 1998 |
| Board of Directors | 1998 – 2004 |
| Board of Directors | 2006 – 2006 |
| Board of Directors | 2017 – 2019 |
| Board of Directors | 2016 – 2017 |
| Board of Directors | 2014 – 2016 |
| Board of Directors | 2003 – 2006 |
| Board of Directors | 1998 – 2001 |
| Board of Directors | 2006 – 2006 |
| Chairman | 2012 – 2012 |
| Chairman | 2012 – 2017 |
| Chairman | 1998 – 1998 |
| Board of Directors | 2012 – 2014 |
| Board of Directors | 2004 – 2006 |
| Chairman | 2017 – 2018 |
| Board of Directors | 2007 – 2011 |
| Board of Directors | 2011 – 2012 |
| Chairman | 2018 – 2019 |
| Chairman | 2011 – 2012 |